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【多選題】
一汽船過河，船速為v1，水流速度是 v2 ，v1 > v2 ，以下說法正確的是（ ）
A.
船頭指向上游與河岸成一定角度θ，cosθ = v2 /v1 時，航行的距離最短，所用的時間最短
B.
船頭指向上游與河岸成一定角度θ，cosθ = v2 /v1 時，航行的距離最短，所用的時間不是最短
C.
船頭指向垂直于河岸航行時，航行的距離最短，所用的時間最短
D.
船頭指向垂直于河岸航行時，航行的距離不是最短，所用時間最短
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舉報參考答案：
舉一反三
【單選題】The main idea of paragraph 4 shows us ______.
A.
children should stay at home instead of going to school
B.
some examples of shoot in US schools
C.
the Americans’ strong feelings about guns
D.
some famous schools in the US
【單選題】The writer of the article seems to think that______.
A.
with hot lines people won’t get advice from their families or friends
B.
hot lines help the callers a lot
C.
people had better pay for the advice and phone calls
D.
the hot line advisers will solve all of the callers’ problems
【單選題】What will the speakers have for breakfast?
A.
Bread and jam.
B.
Eggs and milk.
C.
Milk and bread.
【單選題】It can be known from the report of the US Department of Education that ______.
A.
guns are out of control in US schools
B.
American children don’t have the right to go to school
C.
the number of the expulsions in the USA is smaller than that in other countries
D.
expelling students is the best way to control guns
相關題目：
【單選題】The main idea of paragraph 4 shows us ______.
A.
children should stay at home instead of going to school
B.
some examples of shoot in US schools
C.
the Americans’ strong feelings about guns
D.
some famous schools in the US
【單選題】The writer of the article seems to think that______.
A.
with hot lines people won’t get advice from their families or friends
B.
hot lines help the callers a lot
C.
people had better pay for the advice and phone calls
D.
the hot line advisers will solve all of the callers’ problems
【單選題】What will the speakers have for breakfast?
A.
Bread and jam.
B.
Eggs and milk.
C.
Milk and bread.
【單選題】It can be known from the report of the US Department of Education that ______.
A.
guns are out of control in US schools
B.
American children don’t have the right to go to school
C.
the number of the expulsions in the USA is smaller than that in other countries
D.
expelling students is the best way to control guns
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