It is always difficult being in a foreign country, __________if you don’t speak the language. A.extremely B.naturally C.basically D.especially 答案:D本题考查副词的词义辨析。A项意为“极端地”;B项意为“自然地”;C项“基本上”;D项“尤其,特别地”。根据句意“如果你不会讲(它的)语言,在国外你就总会困难重重”可知答案。基因分离定律的实质是
A.杂种后代出现不同的性状 B.测交后代性状分离比接近1:1
C.F2性状分离比为3:1 D.等位基因在减数分裂时彼此分离