Trai di chuyển được là nhờ
A.chân trai thò ra, thụt vào kết hợp với các động tác đóng mở vỏ tạo áp lực.
B.các động tác đóng mở vỏ tạo lực đẩy.
C.chân trai thò ra, thụt vào.
D.các cơ khép vỏ.

Vỏ trai gồm bao nhiêu mảnh?
A.3.
B.4.
C.1.
D.2.

Điền đáp án đúng vào ô trống
Một cửa hàng buổi sáng bán được 45kg gạo, buổi chiều bán được ít hơn buổi sáng 6kg gạo. Hỏi buổi chiều cửa hàng bán được bao nhiêu ki-lô-gam gạo?
Buổi chiều cửa hàng bán đượckg gạo
A.39
B.
C.
D.

Tìm x:
(Lưu ý: Sử dụng một dấu cách giữa số và dấu)
 
x
+   19
=
68
x
=
x
=
A.68 - 19
B.49
C.
D.

Chân trai có hình
A.lưỡi rìu.
B.lưỡi dao.
C.liềm hoặc lưỡi dao.
D.liềm.

Vỏ trai gồm mấy lớp khác nhau?
A.3.
B.4.
C.2.
D.1.

Choose the sentence that has the same meaning as the root one.
"Why don't you postpone your trip till the autumn, Jim?" said Sarah.
A.Sarah wondered if Jim wanted to postpone his trip till the autumn.
B.Sarah asked Jim why he postponed his trip till the autumn.
C.Sarah suggested that Jim should postpone his trip till the autumn.
D.Sarah didn't think it was a good idea for Jim to postpone his trip till the autumn.

Choose the sentence that has the same meaning as the root one.
"Do you know Long’s address?” he asked me.
A.He asked me if I know Long’s address.
B.He asked me if I knew Long’s address.
C.He asked me if someone knew Long’s address.
D.He asked me for Long’s address.

Choose the sentence that has the same meaning as the root one.
He was very tired but he kept on working.
A.Although he was very tired, but he kept on working.
B.Despite very tired, he kept on working.
C.Though his tiredness, he kept on working.
D.He kept on working although he was very tired.

Choose the sentence that has the same meaning as the root one.
"Are you married?”- Tom said to the woman. 
A.Tom asked the woman if she was married.           
B.Tom asked the woman if she would marry him.
C.The woman told Tom that she was married.       
D.Tom asked the woman did she get married.