决定植物气味的是植物中的（）。A、根 B、花 C、叶绿素 D、果实

Remote administration types are an example of one kind of (71) malicious software, the Trojan horse, or more simply Trojan. The purpose of these programs isn’t replication, (72) to penetrate and control. That masquerade as one thing when in fact they are something else, usually something destructive. There are a number of kinds of Trojans, including spybots, (73) report on the Web sites a computer user visits, and keybots or keyloggers, which record and report the user’s keystrokes in order to discover passwords and other confidential information.

RATS attempt to give a remote intruder administrative control of an infected computer. They work as (74) pairs. The server resides on the infected machine, while the client resides elsewhere, across the network, where it’s available to a remote intruder. Using standard TCP/IP or UDP protocols, the client sends instructions to the server. The server does (75) it’s told to do on the infected computer.

（74）处填（）。

A．W/S

B．S/C

C．B/S

D．C/S

对于n个结点的单向链表(无表头结点)，需要指针单元的个数至少为______。

A．n-1

B．n

C．n＋1

D．2n

设函数f(x)在区间(-1，1)内二次可导，已知f(0)=0，f'(0)=1，且f"(x)＜0当x∈(-1，1)时成立，则

A．当x∈(-1，0)时f(x)＞x，而当x∈(0，1)时f(x)＜x．

B．当x∈(-1，0)时f(x)＜x，而当x∈(0，1)时f(x)＞x．

C．当x∈(-1，0)与x∈(0，1)时都有f(x)＞x．

D．当x∈(-1，0)与x∈(0，1)时都有f(x)＜x．

我国的自然保护区的区域构成依法分为（）。

A、缓冲区

B、核心区

C、延伸区

D、观测区

E、实验区

参加职工基本医疗保险的个人，达到法定退休年龄时累计缴费达到国家规定年限的，退休后继续缴纳基本医疗保险费的，可按照国家规定享受基本医疗保险待遇。