【名词&注释】
水青冈属(beech)
[单选题]的壳斗上苞片结合成同心环。
A. 栎属
B. 青冈属
C. 水青冈属
D. 栗属
查看答案&解析
举一反三：
[单选题]We laugh at jokes，but seldom about how they work．
A. we think
B. think we
C. we do think
D. do we think
[单选题]------Poor Steve! I could hardly recognize him just now!------_______________, He has changed so much.
A. Never mind
B. No problem
C. Not at all
D. Me neither
[单选题]Edward, you play so well. But I _________ you played the piano.
A. didn't know
B. hadn't known
C. don't know
D. haven't known
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