下列对人类生殖和发育的叙述，正确的是

A．受精卵形成和胚胎发育的场所分别是卵巢和子宫

B．胎儿通过胎盘与母体完成物质交换

C．身高和体重迅速增长，是青春期发育最突出的特征

D．怀孕又称着床，是指受精卵植入子宫内膜的过程

WLANs are increasingly popular because they enable cost-effective connections among people and applications that were not possible in the past. For example, WLAN-based applications can enable fine-grained management of supply （71） to improve their efficiency and reduce （72） . WLANs can also enable entirely new business processes. To cite but one example, hospitals are using WLAN-enabled point-of-care （73） to reduce errors and improve overall patient care. WLAN management solutions provide a variety of other benefits that can be substantial but difficult to measure. For example, they can protect corporate data by preventing （74）through rogue access points. They can improve overall network management by integrating with customers’ existing systems. Fortunately, it isn’t necessary to measure these benefits to justify investing in WLAN management solutions, which can quickly pay for themselves simply by minimizing time-（75） deployment and administrative chores.

72（）

A．overhead

B．connection

C．supply

D．effect