【单选题】Parents worry about _________online.
A.
who do their children chat with
B.
who their children chat with
C.
with who their children chat
D.
who their children chats with
【单选题】He is a ________and well-behaved child, but his parents worry about him for he talks too little.
【简答题】Watson与Crick发现DNA双螺旋结构的故事可以给我们哪些启示?
【单选题】—Is it that Jack often plays computer games makes his parents worry about him ? —Yes , I think so .
【单选题】1953年Watson和Crick发现DNA双螺旋结构,标志着生命科学进入了( 阶段)
【单选题】1953年,Watson和Crick发现了
【简答题】Which sort of issues that parents worry about is NOT mentioned in the news?A. Negative body image. B. Sleeping
disorders. C. Depression. D. Poor
ual choices.
【单选题】Watson和Crick发现了DNA双螺旋的结构,开启了分子生物学时代,使遗传的研究深入到分子层次,“生命之谜”被打开,这项成果发表时间是( )