A
There are a lot of choices for free video conferencing apps. Some of the best ones are offered in a list here, where they shine and where they fall short.
Google Hangouts
The free video chat app from Google is a great example of a consumer-grade app. It integrates (合并) with Gmail and Google Calendar, making it easier for users to operate.
Up to 10 participants can join the live conference with a plug-in application. And as it doesn’t support dual（双语） stream video and content, some users complain that the video is not clear or reliable.
Skype
The app, developed by Microsoft, gives 10 users access to a conference. It’s worth noting that Microsoft is integrated with Skype.
A plug-in application is required. Advanced features are fascinating, but only available for paid subscription.
Zoom
The free video conferencing solution from Zoom provides a service for group video calls with over 100 participants. The Zoom Basic plan allows users to have 40-minute calls with a handful of features like screen sharing, local recording and camera filters.
A plug-in application is necessary. All calls, which are limited to 40 minutes or less, are secured.
Lifesize
Lifesize has been in the video conferencing industry for long. By setting up a free account with Lifesize, you can quickly start a free video call with up to 25 participants. It is web-based and doesn’t require downloads or an application on your devices. Guests can join the live call right from the website by clicking on your personal meeting ID link.
To use the additional features like 300-way calling, Microsoft integrations and 4K video conference room systems requires a paid subscription.
21.Which aspect of Google Hangouts is not satisfactory?
A. User capacity. B. Video quality.
C. User-friendliness. D. Technical support.
22.Which app offers a ten-minute conference service with 30 people for free?
A.Google Hangouts. B. Skype. C. Zoom. D. Lifesize.
23.What is special about Lifesize?
A.It integrates with Microsoft.
B.It is completely free of charge.
C.There is no time limit to its conferences.
D.No application is needed for participants.
