促进胰酶分泌的体液因素是______
Shelly had prepared carefully for her biology examination so that she could be sure of passing it on her first______.
荒漠生态系统中生物种类少，无生物多样性。
中国是一个社会主义国家，也是一个发展中国家。
舞蹈作品：舞剧《丝路花雨》
设f(x)在点x0处连续，则______。 A．f'(x0)一定存在 B．f'(x0)一定不存在 C．一定存在 D．不一定存在
低温对生物的伤害分为冷害和______两种。
Write a composition on the topic "Advertisement." Start writing your composition with the topic sentence: "Advertisements are getting their way into people's lives." You are supposed to write at least 100 words in your composition using the words and expressions given below. depend on advertise announce a wide audience set up exaggerate fall victim to
Tom (laid) on the (floor), (reading) a (book).
试述邓小平关于国际形势的判断。
After all this time you'd think he'd have forgotten, ______?
(This book) of (him) used to be one of the best (sellers) (in) the shop.
下列属于条件反射的是______
You can read some English novels but you'd better ______ some simple stories.
肾上腺皮质球状带分泌的激素是______
植物种子在萌发、形成幼苗过程中，有时出现黄化苗现象，其主要原因是______
有关演替顶极理论主要有三种：单元顶极论、______和顶极—格局假说。
Only (within) the past 200 years (scientists have) found (out what) fire (is).
He (wrote) the story, (typing) it (into) the computer and (handed) it to the chief editor.