1. I have cities, but there are not any houses in them. I have forests, but there are not any trees in them. I have rivers, but there is not any water in them. I am a
map
.
2. It isn't my sister or my brother, but it is still the child of my father and mother. Who is it? It's
me
.
3. Mike's grandma has eight children. Half are boys and half are girls. Mike's father has seven brothers and sisters. So Mike's father has
3/three
brothers and
4/four
sisters.
4. What kind of sweet is always LATE for class? It's
chocolate
.
5. There are two brothers. One is on one side, and the other is on the other side. When people say something, they can hear. But they can't see each other(互相). They're
ears
.
6. What kind of dog doesn't bite(咬) or bark(吠叫)? It's a
hot dog
.
7. What has teeth but can't eat? It's a
comb
.
答案：1.map 2.me 3.3/three；4/four 4.chocolate 5.ears 6.hot dog 7.comb
1. Mary is twelve years old. Her father is four times(四倍) as old as her. Her grandfather is twice (兩倍) as old as her father. How old is her grandfather? He is
96 years old
.
答案：【解析】：本題主要考查乘法的實際應(yīng)用以及年齡的計算。
首先，根據(jù)題目描述，Mary是12歲。
接著，題目說她的父親是她的四倍年齡，所以父親的年齡就是$12 × 4 = 48(歲)$。
然后，題目又說她的祖父是她的父親年齡的兩倍，所以祖父的年齡就是$48 × 2 = 96(歲)$。
因此，我們可以通過乘法運算得出祖父的年齡。
【答案】：96 years old.
2. Ann and Bill have five sweets. Bill and Clare have four sweets. Clare and Ann have three sweets. Ann has
2
sweet(s). Bill has
3
sweet(s). Clare has
1
sweet(s). Ann, Bill and Clare have
6
sweet(s).
答案：【解析】：
這是一個關(guān)于線性方程組的問題，但由于是五年級的題目，我們不會使用復(fù)雜的方程組來解答。我們可以通過設(shè)立等式，利用加減法來求解。
設(shè)Ann有a個糖果，Bill有b個糖果，Clare有c個糖果。
根據(jù)題意我們可以得出以下等式：
Ann和Bill共有5個糖果，即 a + b = 5。
Bill和Clare共有4個糖果，即 b + c = 4。
Clare和Ann共有3個糖果，即 c + a = 3。
將這三個等式相加，得到 2(a + b + c) = 12，即 a + b + c = 6。
現(xiàn)在我們可以通過這個等式和之前的等式來求解a，b，c的值。
首先，從 a + b = 5 和 a + b + c = 6 中，我們可以得出 c = 1。
然后，從 b + c = 4 中，我們可以得出 b = 3（因為c已經(jīng)求出為1）。
最后，從 c + a = 3 中，我們可以得出 a = 2（因為c已經(jīng)求出為1）。
【答案】：
Ann has $2$ sweet(s).
Bill has $3$ sweet(s).
Clare has $1$ sweet(s).
Ann, Bill and Clare have $6$ sweet(s).
3. Mike is standing in Group One. There are fifteen students in front of him and thirteen students behind him. How many students are there in Group One? There are
29
students.
答案：15 + 13 + 1 = 29
There are 29 students.
4. If an astronaut has a weight of 72 kg on the Earth, he will have a weight of 12 kg on the Moon. If another astronaut has a weight of 10.5 kg on the Moon, the astronaut's weight will be
63 kg
on the Earth.
答案：63 kg。
5. Lucy goes out for a walk from her home. She walks 4 km east, 3 km south and 4 km west. How far is she from her home now? ______
3 km
A.11 km.
B.8 km.
C.4 km.
D.3 km.
答案：【解析】：
這個問題是一個典型的位移和距離問題，需要用到空間想象和基本的數(shù)學(xué)運算。Lucy從家里出發(fā)，先向東走了4km，然后向南走了3km，最后向西走了4km。我們可以通過畫圖來幫助理解這個問題。
1. Lucy起始于家（我們可以設(shè)這個點為原點(0,0)）。
2. 她先向東走了4km，到達(dá)點(4,0)。
3. 然后向南走了3km，到達(dá)點(4,-3)。
4. 最后向西走了4km，到達(dá)點(0,-3)。
通過畫圖，我們可以清晰地看到Lucy現(xiàn)在的位置是在她家的正南3km處。因此，我們可以通過計算得出她現(xiàn)在離家的直線距離。
由于Lucy最終的位置是在家的正南方，所以我們可以直接通過計算南北方向的位移來得出她離家的距離，即3km。
【答案】：D
6. “團(tuán)購”也瘋狂,做智慧購物達(dá)人。
“Group Buying” allows people to buy things at a lower price. One day, you and your friends go into a restaurant which provides the service of “Group Buying”. And you only have to spend 85 yuan to get a ticket with the value(價值) of 100. If all the food you order costs 160 yuan, using
1
ticket(s) will be the cheapest way.
A.0
B.1
C.2
D.3
答案：【解析】：
這個問題是一個實際應(yīng)用問題，涉及到數(shù)學(xué)中的基本運算和邏輯推理。題目描述了“團(tuán)購”的情境，其中提到使用團(tuán)購票可以以低于面值的價格購買到價值更高的商品或服務(wù)。具體來說，在這個問題中，人們可以花費85元購買價值100元的票。接下來，我們需要計算在不同數(shù)量的票的使用情況下，實際支付的總金額是多少，并找出最便宜的方式。
首先，我們計算不使用團(tuán)購票的情況下的總支出，即160元。
然后，我們考慮使用團(tuán)購票的情況：
1. 如果使用1張團(tuán)購票，那么需要支付85元購買票，并且票可以覆蓋100元的消費，所以還需要額外支付160 - 100 = 60元。因此，總支出是85 + 60 = 145元。
2. 如果使用2張團(tuán)購票，那么需要支付2 * 85 = 170元購買票，但票的總價值是200元，已經(jīng)超過了實際消費的160元，所以不需要額外支付。但考慮到我們只需要160元的服務(wù)，購買2張票會造成浪費，實際有效支付是170元（因為多余的部分沒有被使用）。
3. 如果使用3張團(tuán)購票，支付金額會更高，造成更大的浪費。
最后，我們比較這些支出，找出最低支出對應(yīng)的團(tuán)購票數(shù)量。
【答案】：
B
7. Read and guess
Colleen, Jakes, Hendrik, Vishnu and Tandeka play a game of cops(警察) and robbers(強盜). The robbers' statements are always false while the cops' statements are always true.
a) Colleen says that Jakes is a cop.
b) Hendrik says that Vishnu is a robber.
c) Tandeka says that Colleen is not a robber.
d) Jakes says that Hendrik is not a cop.
e) Vishnu says that Tandeka and Colleen play on different sides.
How many robbers are there?
4
.
答案：4
