皮皮学，免费搜题
登录
搜题
【简答题】
()是指机体感受环境的有效刺激发生反应的能力或特性
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】My uncle’s house in the downtown area is much smaller than ours, but it is twice ____ expensive.
A.
as
B.
so
C.
too
D.
very
【简答题】防止45号钢淬裂的三条措施是什么?
【单选题】My uncle’s house in the downtown area is a bit smaller than that in the countryside, but it is twice _________ expensive.
A.
as
B.
too
C.
rather
D.
very