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【单选题】
鱼类品种提纯的常用方法是()。A.
杂交
B.
近交加选择
C.
家系选育
D.
亲本选择
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
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【单选题】-----Who do you intend to have______your computer? ----- I haven’t decided yet. I wonder if you could help me。
A.
to repair
B.
repaired
C.
to be repaired
D.
repair
【简答题】必需氨基酸是指 但人体不能合成,或者人体合成的速度跟不上需要的氨基酸。
【单选题】A: I was hoping to get some bread from the bakery before it closes. B: ______.
A.
You'd better be quick. It will close at 7:00.
B.
My watch says 6:50,I'm afraid you'll be late. But don't be frustrated.
C.
I don't know when it closes.
D.
I've never been to that bakery.
【单选题】—Can I help you carry the bag? —________________.
A.
Needn’t.
B.
you couldn’t do it.
C.
I could do it myself.
D.
Thank you, but I can manage it myself.
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